 /* 清除外边距，内边距，边框 */
 
 * {
     margin: 0px;
     padding: 0px;
     border: 0px;
     box-sizing: border-box;
     /* 声明C3盒模型 边框 内边距 不在影响盒子大小，盒子内容是宽高减去边框和内边距的大小 */
 }
 /* 可以给超链接去下划线 */
 
 a {
     text-decoration: none;
 }
 /* 去掉无须列表li小圆点 */
 
 li {
     list-style: none;
 }
 /*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */
 /* Document
   ========================================================================== */
 /**
 * 1. Correct the line height in all browsers.
 * 2. Prevent adjustments of font size after orientation changes in iOS.
 */
 
 html {
     line-height: 1.15;
     /* 1 */
     -webkit-text-size-adjust: 100%;
     /* 2 */
 }
 /* Sections
   ========================================================================== */
 /**
 * Remove the margin in all browsers.
 */
 
 body {
     margin: 0;
 }
 /**
 * Render the `main` element consistently in IE.
 */
 
 main {
     display: block;
 }
 /**
 * Correct the font size and margin on `h1` elements within `section` and
 * `article` contexts in Chrome, Firefox, and Safari.
 */
 
 h1 {
     font-size: 2em;
     margin: 0.67em 0;
 }
 /* Grouping content
   ========================================================================== */
 /**
 * 1. Add the correct box sizing in Firefox.
 * 2. Show the overflow in Edge and IE.
 */
 
 hr {
     box-sizing: content-box;
     /* 1 */
     height: 0;
     /* 1 */
     overflow: visible;
     /* 2 */
 }
 /**
 * 1. Correct the inheritance and scaling of font size in all browsers.
 * 2. Correct the odd `em` font sizing in all browsers.
 */
 
 pre {
     font-family: monospace, monospace;
     /* 1 */
     font-size: 1em;
     /* 2 */
 }
 /* Text-level semantics
   ========================================================================== */
 /**
 * Remove the gray background on active links in IE 10.
 */
 
 a {
     background-color: transparent;
 }
 /**
 * 1. Remove the bottom border in Chrome 57-
 * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
 */
 
 abbr[title] {
     border-bottom: none;
     /* 1 */
     text-decoration: underline;
     /* 2 */
     text-decoration: underline dotted;
     /* 2 */
 }
 /**
 * Add the correct font weight in Chrome, Edge, and Safari.
 */
 
 b,
 strong {
     font-weight: bolder;
 }
 /**
 * 1. Correct the inheritance and scaling of font size in all browsers.
 * 2. Correct the odd `em` font sizing in all browsers.
 */
 
 code,
 kbd,
 samp {
     font-family: monospace, monospace;
     /* 1 */
     font-size: 1em;
     /* 2 */
 }
 /**
 * Add the correct font size in all browsers.
 */
 
 small {
     font-size: 80%;
 }
 /**
 * Prevent `sub` and `sup` elements from affecting the line height in
 * all browsers.
 */
 
 sub,
 sup {
     font-size: 75%;
     line-height: 0;
     position: relative;
     vertical-align: baseline;
 }
 
 sub {
     bottom: -0.25em;
 }
 
 sup {
     top: -0.5em;
 }
 /* Embedded content
   ========================================================================== */
 /**
 * Remove the border on images inside links in IE 10.
 */
 
 img {
     border-style: none;
 }
 /* Forms
   ========================================================================== */
 /**
 * 1. Change the font styles in all browsers.
 * 2. Remove the margin in Firefox and Safari.
 */
 
 button,
 input,
 optgroup,
 select,
 textarea {
     font-family: inherit;
     /* 1 */
     font-size: 100%;
     /* 1 */
     line-height: 1.15;
     /* 1 */
     margin: 0;
     /* 2 */
 }
 /**
 * Show the overflow in IE.
 * 1. Show the overflow in Edge.
 */
 
 button,
 input {
     /* 1 */
     overflow: visible;
 }
 /**
 * Remove the inheritance of text transform in Edge, Firefox, and IE.
 * 1. Remove the inheritance of text transform in Firefox.
 */
 
 button,
 select {
     /* 1 */
     text-transform: none;
 }
 /**
 * Correct the inability to style clickable types in iOS and Safari.
 */
 
 button,
 [type="button"],
 [type="reset"],
 [type="submit"] {
     -webkit-appearance: button;
 }
 /**
 * Remove the inner border and padding in Firefox.
 */
 
 button::-moz-focus-inner,
 [type="button"]::-moz-focus-inner,
 [type="reset"]::-moz-focus-inner,
 [type="submit"]::-moz-focus-inner {
     border-style: none;
     padding: 0;
 }
 /**
 * Restore the focus styles unset by the previous rule.
 */
 
 button:-moz-focusring,
 [type="button"]:-moz-focusring,
 [type="reset"]:-moz-focusring,
 [type="submit"]:-moz-focusring {
     outline: 1px dotted ButtonText;
 }
 /**
 * Correct the padding in Firefox.
 */
 
 fieldset {
     padding: 0.35em 0.75em 0.625em;
 }
 /**
 * 1. Correct the text wrapping in Edge and IE.
 * 2. Correct the color inheritance from `fieldset` elements in IE.
 * 3. Remove the padding so developers are not caught out when they zero out
 *    `fieldset` elements in all browsers.
 */
 
 legend {
     box-sizing: border-box;
     /* 1 */
     color: inherit;
     /* 2 */
     display: table;
     /* 1 */
     max-width: 100%;
     /* 1 */
     padding: 0;
     /* 3 */
     white-space: normal;
     /* 1 */
 }
 /**
 * Add the correct vertical alignment in Chrome, Firefox, and Opera.
 */
 
 progress {
     vertical-align: baseline;
 }
 /**
 * Remove the default vertical scrollbar in IE 10+.
 */
 
 textarea {
     overflow: auto;
 }
 /**
 * 1. Add the correct box sizing in IE 10.
 * 2. Remove the padding in IE 10.
 */
 
 [type="checkbox"],
 [type="radio"] {
     box-sizing: border-box;
     /* 1 */
     padding: 0;
     /* 2 */
 }
 /**
 * Correct the cursor style of increment and decrement buttons in Chrome.
 */
 
 [type="number"]::-webkit-inner-spin-button,
 [type="number"]::-webkit-outer-spin-button {
     height: auto;
 }
 /**
 * 1. Correct the odd appearance in Chrome and Safari.
 * 2. Correct the outline style in Safari.
 */
 
 [type="search"] {
     -webkit-appearance: textfield;
     /* 1 */
     outline-offset: -2px;
     /* 2 */
 }
 /**
 * Remove the inner padding in Chrome and Safari on macOS.
 */
 
 [type="search"]::-webkit-search-decoration {
     -webkit-appearance: none;
 }
 /**
 * 1. Correct the inability to style clickable types in iOS and Safari.
 * 2. Change font properties to `inherit` in Safari.
 */
 
 ::-webkit-file-upload-button {
     -webkit-appearance: button;
     /* 1 */
     font: inherit;
     /* 2 */
 }
 /* Interactive
   ========================================================================== */
 /*
 * Add the correct display in Edge, IE 10+, and Firefox.
 */
 
 details {
     display: block;
 }
 /*
 * Add the correct display in all browsers.
 */
 
 summary {
     display: list-item;
 }
 /* Misc
   ========================================================================== */
 /**
 * Add the correct display in IE 10+.
 */
 
 template {
     display: none;
 }
 /**
 * Add the correct display in IE 10.
 */
 
 [hidden] {
     display: none;
 }
 /* em */
 
 em {
     font-style: normal;
 }